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Equity and Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest, Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jul. 07, 2016	Jan. 31, 2013
Investment [Line Items]
Contractually defined redemption value	$ 15.0
Vital River
Investment [Line Items]
Ownership percentage	87.00%	12.00%	75.00%
Noncontrolling interest ownership percentage	13.00%

X

- References

No definition available.

+ Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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- Definition

Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 24(b)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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